The extraction of the LOSVD of galaxies has been an active field of research for many decades. Both parametric and non-parametric approaches have been developed over the years to address this issue. Interestingly original implementations prioritised non-parametric over parametric recoveries, something that has radically changed in the last few decades. Most popular approaches include: Fourier correlation quotient (FCQ) [1]}, [2]}, [3]}, [4]}. Cross-correlation (XC or CCF) [5]}, [6]}. Maximum penalised likelihood (MPL) [7]}, [8]}, [9]}. Direct fitting in pixel space [10]}, [11]}, [12]}, [13]}, [14]}, [15]}, [16]}, [17]}.
